The climate abnormality in Beijing, Tianjin and Hebei in recent 50 years is analyzed, and the obvious effect on water resource decreasing mainly caused by precipitation decrease is discussed. Annual temperature has risen about 1. 77’℃ precipitation reduced about 13.9 percent, water resource decreased about 50 percent in this area since the 1950s’, the serous inconsistency between water demand and supply has caused a series of problems. Some countermeasures to mitigate the water resource crisis are put out, but the measures can only resolve about 50 percent of the water shortage. To thoroughly resolve this problem, cross valley water resource attempering is necessarily.